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AC OFF-WINDING MOTOR PROTECTION Non–Hermetic, Three–Phase Phenolics PRODUCT OVERVIEW The protector consists of a molded phenolic base assembly containing three heaters and a Klixon snap-acting thermal disc with three contacts. The Klixon disc is the neutral point of the motor. Each heater is in series with one of the phase windings of the motor, as well as with one of the contacts on the thermal disc. When the disc snaps open because of overheating, the neutral of the motor is open circuited, thereby shutting down the motor. Dual voltage motors are protected with a single protector, as shown in the wiring diagrams to the right. Klixon is a registered trademark of Sensata Technologies © Copyright Sensata Technologies 2013 Features & Benefits Engineering Samples Provides protection against overheating from running and stalled rotor conditions including: •Single-phasing •Plugging duty •Stalling or failure to start •Heavy overloads •High ambient •Ventilation failures Provide the following information when requesting engineering samples: 1.Motor Horsepower 2.Voltage: single or dual 3.Amperes necessary to raise the motor windings to a stable temperature condition of approximately 130°C for class A, 155°C for class B in 25 C room ambient. 4.The temperature of the protector location iron and the temperature of the protector location air when the motor is stable under above (3) conditions. 5.The locked rotor amperage and time for windings to reach 125°C and 150°C from a 25°C room ambient. 6.Voltage of test. • High voltage light load • Loss of refrigerant charge • Welded start relay • Shorted capacitor • Blocked condenser fan Mounting The degree of protection obtained depends to a large extent on the protector location and its manner of mounting. The protector should be located in the motor so that it will receive the maximum amount of heating from the windings, not only for running, but also for stalled rotor conditions. The best location depends upon the construction of the motor. The protector could be located in be the air-shield, endbell or possibly the stator iron. Preferably, it should be in the discharge unit. AC OFF-WINDING MOTOR PROTECTION Non–Hermetic, Three–Phase Phenolics For dual voltage motors the higher voltage should be used for making the protector application and the lower voltage for selecting the size of the protector based on contact capacity. Because of the many various motor characteristics, a different size Klixon Protector than those indicated in the table above may be necessary for a given horsepower rating. AC OFF-WINDING MOTOR PROTECTION Non–Hermetic, Three–Phase Phenolics Code Structure The following “Sample Code” is an explanation of the type of code which appears on each Klixon three-phase protector. By using this code, it is possible to determine size, type of base, terminals, heater, disc and operating temperatures. Sensata Technologies 529 Pleasant Street Attleboro, MA 02703-2964 U.S.A. Phone 1-508-236-3800 www.sensata.com Important Notice: Sensata Technologies reserves the right to make changes to, or to discontinue, any product or service identified in this publication without notice. Before placing orders, users should obtain the latest version of the relevant information to verify that the information being relied upon is current. Sensata Technologies assumes no responsibility for customers’ product designs or applications. Users must determine the suitability of the Sensata device described in this publication for their application, including the level of reliability required. Many factors beyond Sensata’s control can affect the use and performance of a Sensata product in a particular application, including the conditions under which the product is used and the time and environmental conditions in which the product is expected to perform. As these factors are uniquely within the user’s knowledge and control, it is essential that the user evaluate the Sensata product to determine whether it is fit for a particular purpose and suitable for the user’s application. Sensata Technologies products are sold subject to Sensata’s Terms and Conditions of Sale which can be found at www.sensata.com/terms.htm Updated August 8, 2013